But Windows SMP is still in beta, & it has a lot of bugs. & 'bout the team numbers check this Thread

The only thing bad i have encountered in WinSMP is losing a WU due to the computer not shutting down properly (ie power outage, BSOD, etc). It doesnt always lose it but usually. Everything else has been fine for me. That is no reason to not use it.

If you have a dual core processor and want to fold, there is no reason not to use SMP. WinSMP is fine. I have been folding on it for awhile.